520445747 has 4 divisors (see below), whose sum is σ = 520500600. Its totient is φ = 520390896.

The previous prime is 520445671. The next prime is 520445789. The reversal of 520445747 is 747544025.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520445747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520445747.

It is not an unprimeable number, because it can be changed into a prime (520445447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9122 + ... + 33527.

It is an arithmetic number, because the mean of its divisors is an integer number (130125150).

Almost surely, 2^520445747 is an apocalyptic number.

520445747 is a deficient number, since it is larger than the sum of its proper divisors (54853).

520445747 is a wasteful number, since it uses less digits than its factorization.

520445747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54852.

The product of its (nonzero) digits is 156800, while the sum is 38.

The square root of 520445747 is about 22813.2800578961. The cubic root of 520445747 is about 804.3748587160.

The spelling of 520445747 in words is "five hundred twenty million, four hundred forty-five thousand, seven hundred forty-seven".